Cheat mode:
While in the game hold L1 + R1 + R2 + L2, press Start to access the
pause menu. Select display password. While viewing the password,
press Left, Circle, Square, Right and X. This will allow you to
access invincibility, 50000 oil and full map at the new menu (cheats)
on the pause menu.
Passwords:
KQULLZ - Start on last mission with The Evolved
GTH6JZ - Start on last mission with The Surivors
MHICYZ - Start on mission 7 with The Series 9